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This week we are going to talk about a bug with one of the most misleading names I have seen in a while. It is called copy.fail. And if you saw that name pop up in your feed, you would be forgiven for thinking it was some clever browser demo, or maybe a problem with your clipboard. It is neither.
copy.fail is a Linux kernel vulnerability. Its official label is CVE-2026-31431. And what makes it worth a full episode is not how exotic it is — it is actually quite simple — but how wide its reach is. This single flaw lets an ordinary, unprivileged user on a Linux machine promote themselves all the way up to root. And it does so on nearly every modern Linux distribution shipped since 2017.
- https://xint.io:copy.fail
- https://www.cisa.gov: CVE-2026-31431
- https://www.bugcrowd.com: Hacker Opinion Piece How Lazy Hacking Killed Curls Bug-bounty
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